In the event the tension drops, springs trigger the clutch to release. Evenly spaced ridges, referred to as splines, line the inside and outdoors with the clutch to lock in the gears and the clutch housing. You are able to go through more about these clutches in How Automatic Transmissions https://clutch-plate92468.aboutyoublog.com/36157348/details-fiction-and-clutch-plate